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OPTIMISATION OF THE DYEBATH PH VALUE FOR REDUCING THE ACIDITY OF THE WASTEWATER IN THE PROCESS OF DYEING THE POLYESTER FABRIC WITH DISPERSE DYES
Abstract
Dyeing of polyester fabric is carryng out in slightly acidic me dium; the dyebath pH value is adjusted to 4.5 – 5.5, which resu lts in the huge amount of acidic industrial wastewater. In this paper, dyeing of polyest er knitwear with four disperse dyes in the pH range 4.5 – 7, in order to reduce the amount of acid used in the dyeing process, was investigated. Colour differences between the samples dyed at pH 6.0 and 7.0 and one dyed at pH 4.5 were asseessed using the technique of reflectiometry and expressed in terms of CIELAB coordinates and their ac ceptability were dete rmined according to M&S 83A and CMC (2:1) standards. It was found that at pH 6.0 and 7.0 Disperse Yellow 3 and Disperse Yellow 23 produ ced dyeabilities which were acceptable according to both M&S 83A and CMC (2:1) st andard in comparation to the dyeability obtained at pH 4.5. Disperse Yellow 5 and Disperse Yellow 60 did not produce acceptable dyeabilities neither at pH 6.0 nor pH 7.0, according to both M&S 83A and CMC (2:1) standard, in compar ation to the dyeability obtained at pH 4.5. It can be assumed that polyester dyeing with Disper se Yellow 3 and Disperse Yellow 23 can be carried out at pH 6 – 7, which will reduce the wastewaters acidity, as well as the amount of neutralising agent recquired for their neutralisation.
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References7
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